- A−75 and 200
- B0 and 75
- C−25 and 300
- D−40 and 1000
Explanation:
Semiconductor can be used safely between temperature 0 and 75.
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The process of adding impurities to the pure semiconductor is called
|
(a) Drouping |
(b) Drooping |
(c) Doping |
(d) None of these |
Image formed by a convex mirror is
|
(a) Virtual |
(b) Real |
(c) Enlarged |
(d) Inverted |
The wavelength of
X-rays produced by an X-ray tube is 0.76 Å. The atomic number of the anode material of the tube is
| (a) 20 | (b) 60 | (c) 40 | (d) 80 |
Assertion : Faraday’s laws are consequences of conservation of energy.
Reason : In a purely resistive ac circuit, the current lags behind the e.m.f. in phase.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
The error in measuring the current with a tangent galvanometer is minimum when the deflection is about
|
(a) 0o |
(b) 30o |
(c) 45o |
(d) 60o |
Four charges are arranged at the corners of a square ABCD, as shown in the adjoining figure. The force on the charge kept at the centre O is

|
(a) Zero |
(b) Along the diagonal AC |
|
(c) Along the diagonal BD |
(d) Perpendicular to side AB |
The wavelength of light diminishes μ times (μ = 1.33 for water) in a medium. A diver from inside water looks at an object whose natural colour is green. He sees the object as
|
(a) Green |
(b) Blue |
(c) Yellow |
(d) Red |